Cisco 7604 Configuration Guide - Page 402
class-map, set connection, match access-list, conn-max, conn-rate-limit, random-sequence-number
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Configuring Connection Limits and Timeouts Chapter 21 Configuring Advanced Connection Features configuration. If you configure these settings for the same traffic using both methods, then the FWSM uses the lower limit. For TCP sequence randomization, if it is disabled using either method, then the FWSM disables TCP sequence randomization. NAT also lets you configure embryonic connection limits, which triggers TCP Intercept to prevent a DoS attack. To configure connection limits, TCP randomization, and embryonic limits, see Chapter 16, "Configuring NAT." To set connection limits and timeouts, perform the following steps: Step 1 To identify the traffic, add a class map using the class-map command. See the "Identifying Traffic (Layer 3/4 Class Map)" section on page 20-4 for more information. For example, you can match all traffic using the following commands: hostname(config)# class-map CONNS hostname(config-cmap)# match any To match specific traffic, you can match an access list: hostname(config)# access list CONNS extended permit ip any 10.1.1.1 255.255.255.255 hostname(config)# class-map CONNS hostname(config-cmap)# match access-list CONNS Note In 3.x, when you used the set connection command for an access list (match access-list), then connection settings were applied to each individual ACE; in 4.0, connection settings are applied to the access list as a whole. Step 2 Step 3 To add or edit a policy map that sets the actions to take with the class map traffic, enter the following commands: hostname(config)# policy-map name hostname(config-pmap)# class class_map_name hostname(config-pmap-c)# where the class_map_name is the class map from Step 1. For example: hostname(config)# policy-map CONNS hostname(config-pmap)# class CONNS hostname(config-pmap-c)# To set maximum connection limits, connection rate limit, or whether TCP sequence randomization is enabled, enter the following command: hostname(config-pmap-c)# set connection {[conn-max n] [conn-rate-limit n] [random-sequence-number {enable | disable}]} where the conn-max n argument sets the maximum number of simultaneous TCP and/or UDP connections that are allowed, between 0 and 65535. The default is 0, which means no limit on connections. The conn-rate-limit n argument sets the maximum TCP and/or UDP connections per second between 0 and 65535. The default is 0, which means no limit on the connection rate. The random-sequence-number {enable | disable} keyword enables or disables TCP sequence number randomization. 21-2 Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide using ASDM OL-20748-01
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